How to put MW3 Codes in

this is my very first forum. i found some codes off the internet for mw3. they look cool and i would love to try them. though i have no idea how to put them in... i have always shunned cheating and hacks but now ill be normal because so many other people do it to and i will equal with them. also i would love to join a clan if anyone offers. i only play fridays saturdays or sundays cuz i have hw and i get tired thanks
ill put my ally code up soon. my name on mw3 is AHH The Elite

Cheating for the online experience will not be facilitated on wiihacks. While there may be in cases a gray area in terms of a user's intent, none exist here. Do not make a thread about this again. READ THE RULES!